Five tiers on each shelving unit create vertical storage for bins, tools, or pantry supplies, and the height-adjustable shelves let you reposition each level to fit items of different sizes. Each 29.5 x 11.5 in shelf combines a thick MDF board with a metal frame to support up to 440 lbs, with 2200 lbs total capacity across the rack. Reinforced support ribs and two anti-toppling devices help keep the structure steady in use. Non-slip foot pads and rolled edges improve handling, protect floors, and make loading safer and more comfortable.